Structure and Function of Arteries, Capillaries and Veins Flashcards

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1
Q

Name the blood vessels that carry
blood away from the heart

A

Arteries

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2
Q

What do capillaries do

A

allow exchange of materials between the
blood and tissues

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3
Q

Name the blood vessels that carry
blood back in to the heart

A

veins

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4
Q

Describe the pathway of blood
through vessels from the heart back
to the heart

A

Arteries > Capillaries > Veins

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5
Q

Describe the change in the blood
pressure as it moves away from the
heart

A

increases

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6
Q

Name the channel in each blood
vessel and state the name of the
tissue which lines this

A

Lumen
lined with endothelial cells

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7
Q

Describe the composition of
arteries, beginning with the lumen
moving outwards

A

Endothelial lining
thick middle layer of muscle and elastic fibres
outer layer of connective tissue
elastic fibres

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8
Q

Why do the elastic walls of the
arteries stretch and recoil?

A

To accommodate the surge of blood
after each contraction of the heart

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9
Q

Term used when smooth muscle in
arteries contract

A

Vasoconstriction

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10
Q

The term used when smooth muscle
in arteries relax

A

Vasodilation

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11
Q

Explain the purpose of
vasoconstriction and vasodilation

A

Allows for blood flow to be
controlled

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12
Q

Which feature of a capillary allows
exchange of substances with tissues?

A

Thin walls

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13
Q

Describe the composition of veins,
beginning from the lumen working
outwards

A

Endothelial lining,
thin middle layer of muscle
outer layer of connective tissue and elastic fibres

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14
Q

State the purpose of valves in vein

A

Prevent backflow of blood

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15
Q

The process which causes plasma to
pass through capillary walls into
Tissues

A

Pressure filtration

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16
Q

Give examples of substances which
diffuse from tissue fluid into cells

A

Glucose, oxygen, amino acids, other
small molecular molecules

17
Q

Give examples of substances that
diffuse out of cells into tissue fluid
and then return to the blood

A

CO2 and waste

18
Q

What happens to most of the
tissue fluid?

A

It returns to the blood

19
Q

What happens to excess tissue
fluid?

A

Absorbed by lymphatic vessels and
returned as lymph to the circulatory
system

20
Q

State how tissue fluid and blood
plasma differ in composition

A

plasma proteins are too large to be filtered
through capillary walls so aren’t found in tissue fluid

21
Q
A